Re: Random fill

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On Sun, Aug 30, 2009 at 5:58 AM, Stroker<dmcryptmailman@xxxxxxxxxxxxxxxx> wrote:
> So, I estimate it will take 80 hours to fill my drives
> via: dd if=/dev/urandom of=/dev/sdb1

Yip, that's definitely too long for me to wait.

> There seems to be mixed opinions regarding the use of
> frandom or erandom.
>
> My question is, wouldn't the following command fill my
> drives with randommess?  Much more quickly than urandom?
>
> dd if=/dev/zero of=/dev/mapper/encrypted_sdb1
>
> Perhaps change the key afterward, or even delete/rebuild
> the dm-crypt block?

That's how I do things.  If the cipher you're using is vulnerable to
known plaintext attacks then you have fair bigger issues than someone
being able to guestimate how much encrypted data you might have.

-- Roscoe
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